VPAAMP-295: Add trickplay live-point bypass when accumulated latency exceeds threshold

[nu641001]

Reason for change: When a live stream accumulates >= 10s of target-latency increments, ie to final target reaches 16sec (e.g. due to repeated rebuffering), the live-point guard in SetRateInternal was preventing fast-forward trick-play even though the player was significantly behind the live edge. Risks: Low
Test Procedure: Test with L1 unit tests (PrivAampTests, PlayerInstanceAAMPTests — 481 + 342 tests all passing); manual LLD stream playback to verify fast-forward unblocked after sustained latency accumulation
Priority: P1

Change-Id: I5046d25eb63bec3c7c240c329b4521b0b8ff814e

[Copilot]

Pull request overview

This PR updates the live-point “skip SetRate” guard in PlayerInstanceAAMP::SetRateInternal so fast-forward trickplay is allowed at live point when the stream has accumulated significant latency (>= 10s of latency-threshold increments), enabling catch-up behavior after repeated rebuffering. It introduces a latency-threshold query on PrivateInstanceAAMP backed by AampLatencyMonitor, and adds L1 unit tests (with supporting mocks/fakes) to validate the new decision paths.

Changes:

• Add PrivateInstanceAAMP::IsLatencyExceedingTrickplayThreshold() and AampLatencyMonitor::GetAccumulatedLatencyIncrementMs() to drive the bypass decision.
• Update SetRateInternal live-point guard to also consider sink-paused state and accumulated-latency threshold.
• Add/extend L1 tests plus mocks/fakes to validate threshold behavior and guard bypass/short-circuiting.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
main_aamp.cpp	Updates the live-point guard in SetRateInternal to bypass when latency exceeds the threshold and when paused.
priv_aamp.h	Declares IsLatencyExceedingTrickplayThreshold() with API documentation.
priv_aamp.cpp	Implements the threshold check using AampLatencyMonitor’s accumulated latency.
AampLatencyMonitor.h	Declares GetAccumulatedLatencyIncrementMs() API.
AampLatencyMonitor.cpp	Implements the accumulated-latency getter under mutex.
AampDefine.h	Adds DEFAULT_ACCUMULATED_LATENCY_THRESHOLD_MS (10s) constant.
test/utests/mocks/MockPrivateInstanceAAMP.h	Adds mock method for IsLatencyExceedingTrickplayThreshold().
test/utests/mocks/MockAampLatencyMonitor.h	New mock to control accumulated-latency getter via fake monitor.
test/utests/fakes/FakePrivateInstanceAAMP.cpp	Adds fake delegation for IsLatencyExceedingTrickplayThreshold() to the mock.
test/utests/fakes/FakeAampLatencyMonitor.cpp	Adds fake implementation delegating accumulated-latency getter to the mock pointer.
test/utests/tests/PrivAampTests/PrivAampTests.cpp	Adds unit tests for threshold boundary conditions and wires the latency-monitor mock lifecycle.
test/utests/tests/PlayerInstanceAAMP/PlayerInstanceAAMPTestsMain.cpp	Extends/ adds SetRateInternal tests for guard behavior with/without accumulated-latency threshold and for short-circuit cases.